Turret-feed stop for lathes.



c. L. LI BBY. TURRET FEED STOP FOR LATHES.

' APPLICATION FILED FEB. 6, 1908. 968,374. Patented Aug. 23, 1910.

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' 7 40 5X 5 65 5 7 WITNESSES: v INVENTOR. W W Charles L.Li]a

6W BY y ATTORNEY.

"ms NORRIS PETERS co., WASHINGTON, n. c.

G. L. LIBBY. TUBBBT FEED STOP FOR LATHE'S.

APPLIOATIOH FILED FEB. 6, 1908. 968,374. Patented Aug.23,1910.

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G. L. LIBBY. TUBRBT FEED STOP r011 LATHES.

APPLICATION FILED P113. 5, 1908. 968,374. Patented Aug. 23, 1910.

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A TTORNEY.

CHARLES L. LIBBY, 0F INDIANAPOLIS, INDIANA.

TURRET-FEED STOP FOR LATHES.

Specification of Letters Patent.

Application filed February 6, 1908.

Patented Aug. 23, 1910.

Serial No. 414,502.

To all whom it may concern:

Be it known that I, CHARLES L. LIBBY, of Indianapolis, county of Marion,and State of Indiana, have invented a certain new and useful Turret-FeedStop for Lathes; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, in which like letters refer to like parts.

The object of this invention is to provide an improved stop mechanismfor controlling the feed of the turret in a turret lathe.

One feature of the invention consists in the combination with a downwardextension from the turret, of an adjustable stop mechanism controlled bythe revoluble adjustment of the turret, whereby the stop mechanism isadjusted indirectly and automatically when the operator turns the turretto bring the desired tool therein into working position. To this end theturret is provided with a downward projection carrying a camshapedflange which oscillates the feed stop shaft so as to set the stop armthereon in position to engage a certain one of a number of stops. Thereis one stop corresponding with each tool carried by the turret and thevarious stops can be variously adjusted so that one tool will cut acertain distance and another tool a different distance, whereby eachtool can do its appropriate work and the stop mechanism will becontrolled by the adjustment of the turret itself.

Another feature of my invention consists in novel means actuated by thefeed stop shaft for stopping the feed mechanism. Along with this part ofthe invention there is provided a split ring clutch operable indirectlyby the feed stop shaft for stopping and starting the turret feed.

Another feature of the invention consists in providing in connectionwith the foregoing an indicator for use in doing very fine Work. Thefeed stop mechanism is approximately adjusted to the work desired and,when the feed is stopped thereby, the stopping position will beindicated, and a scale is provided in connection with the indicatorwhereby the operator is informed to what extent he should further feedthe turret by hand in order to make the particularly accurate cutdesired.

The full nature of this invention will be ings and the followingdescription and claims.

In the drawings Figure l is a side elevation of a part of the turretlathe, parts being broken away and parts in section. Fig. 2 is the sameview of a part of what is shown in Fig. 1 with the feed unlocked. Fig. 3is an elevation of the friction ring. Fig. 4 shows front and sideelevations of the friction lever. Fig. 5 is a horizontal section on theline 5-5 of Fig. 1. Fig. 6 is a plan view of the stop block mechanismand a portion of the bed of the lathe. Fig. 7 isa transverse section onthe line 77 of Fig. 6. Fig. 8 is a longitudinal section on the line 88of Fig. 6. Fig. 9 is a section on the line 9-9 of Fig. 6. Fig. 10 is aside elevation of a portion of the upperpart of the turret base andshowing the feed indicating mechanism. Fig. 11 is a vertical transversesection on the crooked line 11-l1 of Fig. 10. Fig. 12 is a verticalsection on the line 1212 of Fig. 13, parts being in elevation. Fig. 13is partly in plan and partly in sec tion on the line 1313 of Fig. 12,parts of the turret base being broken away. Fig. 14; is a side elevationof the disk on the inner end of the stop shaft. Fig. 15 is a plan viewof the same. Fig. 16 is a vertical section on the line 16-16 of Fig. 13.Fig. 17 is a vertical section on the line 1717 of Fig. 13. Fig. 18 is anend elevation of the near end of the construction shown in Fig. 13.

As shown in the drawings, there is a lathe bed 20 with a turret slide 21mounted thereon and having an upward projection 22 on which the turret23 is mounted, said turret being secured on the part 22 by a clamp ring24. To the under side of one lateral edge of the turret slide the apron25 is secured.

As seen in Fig. 12, there is a central downwardly extending turret post26 from the turret that fits in the bearing ring 27 which is secured uon the turret slide 21. Upon the lower enc of the turret post a cam ring28 is secured, it having an annular cam-like flange 29 secured about itsperiphery. This cam-like flange at 29 has a sharp inclination, whereasat other points the inclination is gradual.

There is a feed stop shaft 30 mounted horizontally above the lathe bedin the bearing 31 at one end of the turret slide and in one wall of theextension 22 near the middle of the turret slide; and upon the inner endof said shaft a disk 33 is secured having an arm 3st carrying a pin 35which rides upon and is actuated by the cam-like flange 29 abovedescribed. Under said shaft there is a dove-tailed groove 134longitudinally of the bed to receive the adjustable block 135 whichcarries the stop pins 36. The block 135 has an extension 37 with holesthrough it, whereby it is clamped in position on the bed by the bolts 38that have dovetailshaped heads 39 fitting in the groove 131, as shown inFig. 9. In this manner said block with its series of pins 36 may beadjusted and held in any position with reference to the feed stop arm d0on the sleeve 41 that is secured rigidly on the shaft 30. A stop screw13 is secured in the end of each pin 36 and the number of pins 36 agreeswith the number of tool-holding places in the turret, and said pins aremounted longitudinally adjustable in the pin block 35, as shown in Figs.6, 7 and 8, and the pin block is provided with six longitudinal holesfor that purpose. In the portion of the pin block 135 above the pins 36there is a transverse slot for the latch bar 45 which is hinged at oneside of the block and at the other end is held by the catch L6. The pinshave a series of notches 47 in their upper sides to receive the latchbar 15. Consequently any pin can be independently adjusted so as to stopthe turret feed to suit the tool and work at the time.

After the proper pin 36 has been set so as to throw the turret out ofoperation at the right point in its work, and the turret has beenadjusted to bring the tool therein. to the proper position for work,such turn of the turret revolves the cam-like flange 29 and it, actingthrough the pin 35, the disk 33 and shaft 30, will turn the stop arminto the proper position to engage the screw 13 on the particular pin 36that corresponds with the hole 100 in the turret holding the tool whichis to be used.

During the operation of the lathe, the turret and turret slide movelongitudinally of the bed, whereas the stop block 135 is held stationaryin the bed. Therefore, when the screw 13 of the pin 36 is engaged by thestop arm etO secured to the shaft 40, it will stop the further movementof the shaft 30 and, as the turret slide proceeds further, draw the disk33 so as to move the arm 50 secured to the feed stop rod 51 far enoughto trip the feed of the turret and turret slide on the bed. For thatpurpose the inner end of the arm 50 has a pin 52 that projects up intothe slot 53 on the under side of the disk 33, as seen in Fig. 12.

The feed stop 51 is mounted transversely of the machine and horizontallyin the tur ret slide and projects out to one side thereof and hassecured to it a handle 54 and also an arm 55 that engages pin 156 on.the friction lever which is fulcrumcd by means of the pin 57 in thecircular flange 58, projecting from the apron 25, see Fig. 5. Thebearing pin 57 of the friction lever 56 has a flat extension 59 thatprojects in between the split ends of the friction ring 60, see Fig. 3,so as to open said ring.

The friction clutch ring 60 mounted within the pilot wheel 63 so that,when the split ring is spread into frictional engagement with the pilotwheel 63, it locks the pilot wheel from rotation. The pilot wheel ismounted on the shaft 64, that extends to and controls the operation ofthe feed mechanism, which, however, is not herein shown as this stopfeed mechanism may be used in connection with the various forms of feedmechanisms. lVhen the split ring 60 is expanded it starts the feed andwhen the lever 56 is thrown into the position shown in Fig. 2 to permitthe ring 60 to contract, the pilot wheel can then revolve and the feedwill be stopped.

0n the shaft 30, see Figs. 13 and 17, there is a spring coiled spirallythat is fastened at one side to the pin 71. The spiral end of the springis coiled within the sleeve ll, so that said spring has two functions.The spiral form thereof causes it to move the shaft 30 longitudinally toreturn it to its normal position after the feed mechanism has beenthrown out of gear automatically, as above described, and after theturret has been returned to its starting position again. Likewise, saidspring 70 has a torsional effect on the rod 31 that tends to hold thepin down upon the cam-like flange 29 all the time.

hen it is desired to operate the turret without the stops heretoforedescribech'the lever on the outer end of the shaft 30 is oscillated orits outer end turned up .wardly until the pin Tet reaches the upper endof the boss 73 and enters a hole or detent, and when in that positionthe arm 10 on the shaft 30 will have been oscillated far enough so thatit will not engage any stop, but ride above the right hand one, and atthe same time the pin 35 at the other end of the shaft 30 will projectabove the highest point of the cam-like flange 29 and rest in the notch72 in the downward extension from the turret, see Fig. 12.

The stop mechanism heretofore described satisfactorily controls andstops the machine while doing ordinary work requiring ordinary accuracy.\Vhen, however, it is necessary to do very fine work, beyond theaccuracy of the stop mechanism heretofore described, I provide inconnection with said stop mechanism an indicator for indicating in verysmall fractions the cutting movement of the machine, whereby theoperator is enabled to complete the cutting operation,

when very fine work is being done, by the further feeding movement ofthe machine by hand. To the foregoing end a connecting rod 80 is pivotedto the arm on the feed stop rod 51, and when said arm 50 is given ahorizontal swinging movement by the disk 33 on the feed rod 30 as thelatter stops, the indicator 81 is moved along a scale 82 visible in theslot 83 in the side of the turret base extension 22. The indicatingfinger 81 is fulcrumed at 84 between its ends.

To do very fine work the stop mechanism above described is set so as toapproximately finish the cut when the machine is stopped by such stopmechanism,the indicating finger 81 is moved along the scale 82 to acertain indicating point or mark. Then the operator can tell by saidscale, the spaces of which may represent thousandths of an inch in thecutting movement of the machine, exactly how much fart-her to feed themachine by hand to cause it to cut with the fine degree of accuracydesired for the particular work in hand.

What I claim as my invention and desire to secure by Letters Patent is:

1. A lathe including a bed, a turret slide thereon, a turret revolublymounted on said slide means for feeding said turret slide along the bed,a plurality of stationary stops, a shaft traveling with said turret,means actuated by said shaft for stopping the feed, an arm mounted onsaid shaft and adapted to engage any one of said stops, means controlledby the revoluble movement of the turret for turning said shaft so saidarm will engage the proper stop, and means for holding said arm in aposition not to engage any stop.

engage any one of said stops, an eccentric pin mounted on said shaft, acam like flange surrounding the downward extension from the turret uponwhich said pin rides, whereby a revoluble movement of the turret willturn the shaft so as to cause the arm thereon to engage the proper stop,and a recess in said turret to receive said eccentric pin and hold theshaft so the arm thereon will not engage any stop.

3. A lathe including a turret, an adjustable mechanism for stopping thefeed thereof, an indicator controlled by said feed stop mechanism forindicating the exact position at which the turret stopped, and a scalewith said indicator to indicate the extent of any further movement ofthe turret by the hand.

4. A lathe including a turret, means for feeding the turret, anoscillatory rod for stopping the feed, an indicator, a scale along whichit moves, and a connection between the indicator and said feed stop rod,whereby the extent of oscillatory movement of the rod will be indicatedby the indicator.

In witness whereof, I have hereunto affixed my signature in the presenceof the witnesses herein named.

CHARLES L. LIBBY.

Witnesses:

OLIVE BBEEDEN, V. H. LOCKWOOD.

